复杂方程计算专项练习题(12页).doc
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1、-复杂方程计算专项练习题-第 12 页小学复杂方程专项练习题(1)2x+5=5x7, (2)3(x2)=25(x2),(3) =1,(4) 5(X+16.81)=,(5)0.2x+=8x,(6) X+(3X16)=10(X+1), (7) x+1=x+3,(8)6(3x2)4(4x3)=18x,(9)4(x2)+20x4=5(12x),(10)1.6(x0.45)=5,(11)35(x2)15(5x6)=(22x63)21(3x4),(12)x15+0.4=x120.1,(13) 150.54x=7-(14) x2=0.25x,(15) 5X+7.25=122.5X,(16) 2(x+2)3=
2、3x5,(17) x+(3x16)25%=10(x+1),(18) x1.4=3.6+x,(19)1.2:=,(20)=8+x,(21) 8(x2)=2x+7,(22) 6(x3.5)=17.8+2x,(23) 5(x+16.84)=0.2,(24)(9+):(9)=5:3,(25)x+(3x16)25%=10(x+2),(26)(X+12)=42X,(27)2(X055)=,(28)7(x+6)3x=4(2x+5),(29)=2.5,(30) 60(x+10)=5 (31) (282x)=6(x5)(32) 64(2x5)=32 (34)1(x45%)=2.8,(35)5(X+4)=26.6
3、X,(36(37)3(x+2)=4(x+1),(38)(x+2)=x+1(39)76(x2)=52x32(40)81x342=76(x2)(41)3(2x)+5(4x3)=4(x+1)(42)15(5.5x)=2x(43)16+x=12+2x+x(44)2(x4)=3(x12)(45)0.4(4x)=14 (46)8(x2)=2(x+7),(47)30%x+85=70%x+25,(48)8.51.25.3x=8.54x(49)5x2(32x)=16x23(50)(x5)59=(x12)12(51)(10x)2=5x7(52)2.7x1.8=1.2x+2.7,(53)85(6x+0.7)=10x
4、+0.5,(54)8.5x3.9x=55.2(x18),(55)122x19=(x19)5,(56)3.5x+2=4x1,(57)=(58)X+(3X16)25%=10(X+1)(59) 75(x+10)=2,(60)5x3(28x)=12+2x,(61)6(x+1)=0.5(10x+16),(62)5(x+2)=4(x+9),(63)127.5(2x+3)=15,(64)3(x+2)=4(x+1),(65)8(x1.5)=x+0.6,(66)7(x+6)3x=4(2x+5),(67)4x2(5.5x)=3.5x8,(68)2.8x=19.326.4x,(69)5(y4)7(7y)9=123(
5、9y),(70)35(x2)15(5x6)=22x6321(3x4),(71)2.6x=51.63.4x,(72)3(4x2)2(3x+3)=98x,(73)20+4x=6x24,(74)5(x1)=x+1,(75)3(3x2)=100.5(x3.5),(76)0.4(x0.2)+1.5=0.7x0.38,(77)(0.6x+420)(x+20)=3,(78)35(2x)+15(65x)=22x+7+21(43x),(79)5(3x4)2(x1)=5(2x1)(80) x=4.9+x,(81)3x+5=2x+,(82)X3.2=(18x)5,(83)4(4x6)=5(3x+1),(84)10X
6、=3(2X+17)+45,(85)5.7(X0.2)=5.1(X+0.6)+4,(86)(3x+4)+x=7(x5)(87)(9+21)x=66x6040440,(88)x2.5=(x1.8)2(89)12+(x12)+x=x(90)3(X3)+4(3X2)=7(2X),(91)=2,小学复杂方程专91题参考答案:(1)2x+5=5x7, 2x+52x=5x72x, 3x7=5, 3x7+7=5+7, 3x=12, 3x3=123, x=4;(2)3(x2)=25(x2), 3x6=125x, 3x6+5x=125x+5x, 8x6=12, 8x6+6=12+6, 8x=18, 8x8=188
7、, x=2.25;(3) =1,()24=124, 6(y+2)4(2y3)=24, 302y=24, 302y+2y=24+2y, 2y+24=30, 2y+2424=3024, 2y=6, 2y2=62, y=3(4) 5(X+16.81)=,5(X+16.81)(X+16.81)=(X+16.81), (X+16.81)=5, (X+16.81)5=55, X+16.81=25, X+16.8116.81=2516.81, x=8.19(5)0.2x+=8x,0.2x+x=8x+x, 1.8x+=8, 1.8x+=8, 1.8x=7.2, 1.8x1.8=7.21.8, x=4(6)X+
8、(3X16)=10(X+1), X+(3X16)4=10X+10, X+12X64=10X+10, 13X64=10X+10, 13X64+64=10X+10+64, 13X=10X+74, 13X10X=10X+7410X, 3X=74, 3X3=743, X=(7)x+1=x+3,x+1x=x+3x, x+1=3, x+11=31, x=2(8)6(3x2)4(4x3)=18x, 18x1216x+12=18x, 18x16x+8x=0, 10x=1, x=110, x=;(9)4(x2)+20x4=5(12x), 4x8+20x4=510x, 24x+10x=5+12, 34x=17,
9、x=1734, x=;(10)1.6(x0.45)=5, x0.45=1.65, x0.45=0.32, x=0.32+0.45, x=0.77;(11)35(x2)15(5x6)=(22x63)21(3x4), 35x7075x+90=22x6363x+84, 35x7075x+90-22x+63x=22x63-63x+84-22x+63x x+20=21, X+20-20 =2120, x=1(12)x15+0.4=x120.1, x+0.4=x0.1,x+0.4x=x0.1x, 0.4+0.1=x0.1+0.1, 0.560=x60, x=30;(13) 150.54x=7- 150.5
10、4x=7- 150.53.5x=7, 150.53.5x+3.5x=7+3.5x, 150.57=7+3.5x7, 143.53.5=3.5x3.5, x=41(14) x2=0.25x, x2+=0.25x+, x2=0.25, x2+2=0.25+2, x=2, x=4(15) 5X+7.25=122.5X, 5X+7.25+2.5X=122.5X+2.5X, 7.5X+7.25=12, 7.5X+7.257.25=127.25, 7.5X=5, 7.5X7.5=57.5, X=(16) 2(x+2)3=3x5, 2x+43=3x5, 2x+1+5=3x5+5, 2x+6=3x, 2x+6
11、2x=3x2x, x=6(17) x+(3x16)25%=10(x+1), x+12x64=10x+10, 13x64=10x+10, 13x6410x=10x+1010x, 3x64+64=10+64, 3x3=743, x=(18) x1.4=3.6+x, x1.4x=3.6+xx, x1.4=3.6, x1.4+1.4=3.6+1.4, x=5, x=5, x=60,(19)1.2:=, x=1.25, x=6, x=6, x=9(20)=8+x,()3=(8+x)3, 5x2=24+3x, 5x23x=24+3x3x, 2x2=24, 2x2+2=24+2, 2x=26, 2x2=26
12、2, x=13(21) 8(x2)=2x+7, 8x16+16=2x+7+16, 8x=2x+23, 8x2x=2x+232x, 6x=23, 6x6=236, x=3(22) 6(x3.5)=17.8+2x, 6x21=17.8+2x, 6x212x=17.8+2x2x, 4x21+21=17.8+21, 4x4=38.84, x=9.7;(23) 5(x+16.84)=0.2,5(x+16.84)(x+16.84)=0.2(x+16.84), 5=0.2x+3.368, 53.368=0.2x+3.3683.368, 1.6320.2=0.2x0.2, x=8.16;(24)(9+):(9
13、)=5:3, 3(9+X)=5(9X), 39+3X=595X, 27+3X=455X, 3X+5X=4527, 8X=18, 8X8=188, X=2.25;(25)x+(3x16)25%=10(x+2), x+(3x16)=10x+102, x+(3x16)4=10x+20, x+3x4164=10x+20, x+12x64=10x+20, x+12x10x=20+64, 3x=84, 3x3=843, x=28(26)(X+12)=42X, X+12=42X, X+=42X, X+=42X, X=X, X+X=X+X, X=, X=, X=;(27)2(X055)=,2(X055)(X0
14、.55)=(X0.55), (X0.55)=, (X0.55)=, X0.55=, X0.55+0.55=0.46875+0.55, X=1.01875;(28)7(x+6)3x=4(2x+5), 7x+423x=8x+20, 42+4x=8x+20, 4x+20=42, 4x+2020=4220, 4x=22, 4x4=224, x=5.5;(29)=2.5, 15=2.5(3x+5), 7.5x+12.5=15,7.5x+12.512.5=1512.5, 7.5x=2.5,7.5x7.5=2.57.5, x=(30) 60(x+10)=5 60(x+10)(x+10)=5 (x+10) 5
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